tree 0f50d9755fa5c4d33fa4ab420de458a8b84653ef
parent 04212acc42d4c69bf3dd93f5342b040d7a2eb741
author Justin Chen <justin.chen@broadcom.com> 1692643971 -0700
committer Pierre Couillaud <pierre@broadcom.com> 1726009815 -0700

BACKPORT: serial: 8250_bcm7271: improve bcm7271 8250 port

The 8250 BCM7271 UART is not a direct match to PORT_16550A and other
generic ports do not match its hardware capabilities. PORT_ALTR matches
the rx trigger levels, but its vendor configurations are not compatible.
Unfortunately this means we need to create another port to fully capture
the hardware capabilities of the BCM7271 UART.

To alleviate some latency pressures, we default the rx trigger level to 8.

Bug: 365149220
Change-Id: I41005a210439a3a54a9af16a96583662dc8d786d
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Acked-by: Doug Berger <opendmb@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/1692643978-16570-1-git-send-email-justin.chen@broadcom.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 42a569cd0d774fd575395a84481f87a1aaa530df)
Signed-off-by: Danesh Petigara <danesh.petigara@broadcom.com>